Mixed Mode Fracture Concepts in Sructural Concrete Design


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Title: Mixed Mode Fracture Concepts in Sructural Concrete Design

Author(s): Oral Buyukozturk and Kwang M. Lee

Publication: Special Publication

Volume: 134


Appears on pages(s): 47-62

Keywords: bridges (structures); cracking (fracturing); crack propagation; failure; fracture properties; joints (junctions); precast concrete; shear properties; shear stress; structural design; Design

Date: 9/1/1992

Discusses the shear design problem in concrete in the context of mixed mode crack propagation in concrete structures. Shear behavior and fracture of precast concrete segmental bridges are presented as a design case study. Joints between the precast segments of these bridges are critical locations through which large shear stresses, combined with normal stresses, must be transmitted. Crack initiation and propagation at these locations represent a mixed mode concrete fracture problem. General concepts for the representation of mixed mode fracture in concrete are briefly discussed, and a combined analytical and experimental methodology is presented for predicting this cracking behavior. Finally, using the developed fracture mechanics approach, a preliminary design concept is proposed for the shear design of prestressed concrete elements.